I have an '83 R65. Great bike. Very light weight, and handles well in the city. And your sitting fairly high up, which is helpful in the city. And they are easy to work on and very simple. Parts are for the most part easy to come by. I did a complete resto on mine. The only parts I had trouble getting was a front master cylinder and brake line. Getting the carbs synced is the hardest thing. Make sure you do a valve adjustment prior to trying to sync carbs- Lesson learned. I have the single disc front brake. Seems like plenty of stopping force.
If you are working on your own bike, here is the forum for all R65 knowledge:
The Unofficial and Purposely Disorganized R65 Forum
Ive got plenty more links if you end up getting a R65 and work on it. Parts, etc.